Receptacles – Closures – With closure opening arrangements for means
Patent
1999-03-15
2000-10-03
Cronin, Stephen K.
Receptacles
Closures
With closure opening arrangements for means
220276, 206508, 206509, B65D 1734
Patent
active
061260290
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a can of the type indicated in the preamble of claim 1.
BACKGROUND ART
A circular can with a cover and a bottom member has been known for a long time, where the cover and the bottom member are secured by means of a closing flange to the cylindrical body of the can. The top side of the cover is provided with a pull ring, viz. an easy-open device, as well as upwardly projecting stacking projections, and the bottom member is provided with corresponding stacking projections. When two identical cans are stacked atop one another, the pull ring is almost completely protected from bumps and impacts because the stacking projections transfer the vertical pressure between the cans while they simultaneously maintain such a distance between the cover of the lower can and the bottom surface of the upper can that the pull ring is not squeezed. Such a can is, however, not completely satisfactory because the projections interfere with the distribution of the material in the cover which may cause undesired tensions in said material and consequently weak, i.e. leaking portions at the score line during the handling of the can. Furthermore it turned out that a very high number of cans of this type stacked atop one another involves a risk of the lower can leaking already when it is subjected to a vertical load of approximately 40 N. In addition, the manufacture of such a can is not as easy as it should be because when the cover is to be seamed onto the body of the can it is not easy to make room for a closing chuck between the nose of the pull ring and the cover closing flange, said closing chuck functioning as a counter-tool for the seaming implement.
U.S. Pat. No. 1,650,520 discloses a stackable can with a cover and a bottom member but without a pull ring.
U.S. Pat. No. 4,182,460 discloses a can with a cover provided with a pull ring and a score line. The pull ring does not present a slit in its intermediary portion.
BRIEF DESCRIPTION OF THE INVENTION
The object of the invention is to provide a can of the above type which compared to known cans is less vulnerable at the score line during the handling procedure, which can withstand a vertical load of up to 600 N without leaking and without the pull ring being damaged, and which is easy to manufacture because it allows room in a better manner than the known cans for a closing chuck at the seaming of the cover. Further, the can must be easier to open than the prior art cans.
The can according to the invention is characterised in the features indicated in the characterising clause of claim 1.
As a result it is possible to completely avoid the known projections increasing the risk of leaks. In addition, the width of the bottom flange can be increased and thereby provide a large area absorbing the vertical stacking pressure exerted on the cover of the can without thereby causing the bottom flange to destroy the pull ring of the lower can significantly. The latter is obtained because the nose of the pull ring is positioned at a distance away from the cover closing flange of this can in the stacked position of said can. It is not possible for the nose to be pressed at the wrong moment downwards into the score line by the bottom flange thereabove, because the space between said nose and the cover flange is improved. As the bottom flange is of a considerable height, a sufficient distance is ensured between the cover of a can and the bottom surface of the can stacked thereon. The can according to the invention is furthermore easy to manufacture because the increased space between the nose of the pull ring and the cover closing flange allows an easy insertion of a closing chuck towards the cover, i.e. on the location where the cover closing flange is to be provided. When the can is opened, the nose slides in a first phase in a particularly reliable manner outwards towards the cover closing flange, i.e towards the score line. This happens when the handle part of the pull ring is slightly lifted. In the next phase of the opening of the can, t
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Cronin Stephen K.
Glud & Marstrand A/S
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